Focus Features’ Loving will be the first theatrical film to screen at the National Museum of African American History and Culture in Washington, D.C.. Monday evening’s invitation-only screening of the Jeff Nichols drama at the newly opened museum’s Oprah Winfrey Theater will be preceded by a reception and panel discussion with the writer/director and stars Joel Edgerton and Ruth Negga. Loving, set for a November 4 limited release with a subsequent expansion, is a biopic…